Dual metallocene bimodal HDPE resins with improved stress crack resistance

US12404357B2 · kind B2 · utility

Assignee

• Chevron Phillips Chemical Company LP · US

Inventors

• Youlu Yu · Bartlesville, US
• Qing Yang · Bartlesville, US
• Ashish M. Sukhadia · Bartlesville, US
• David A. Soules · Bartlesville, US
• Jeremy M. Praetorius · Bartlesville, US
• Vivek Rohatgi · Owasso, US

Key dates

• Filing date: Jan 14, 2022
• Grant date: Sep 2, 2025
• Expiry date: Nov 26, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2420/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Ethylene-based polymers having a density from 0.94 to 0.96 g/cm3, a Mn from 5,000 to 14,000 g/mol, a ratio of Mw/Mn from 18 to 40, and at least one of a PENT value at 2.4 MPa of at least 11,500 hr and/or a W90 from 7.5 to 15 wt. % are disclosed. Additional ethylene polymers can have the same density, Mn, and Mw/Mn values, as well as a relaxation time from 0.5 to 3.5 sec, a CY-a parameter from 0.48 to 0.68, a HLMI from 5 to 11 g/10 min, a viscosity at HLMI from 3,000 to 7,500 Pa-sec, and a higher molecular weight component (HMW) and a lower molecular weight (LMW) component, in which a ratio of the number of SCBs at Mp of the HMW component to the number of SCBs at Mp of the LMW component is from 3.5 to 8.